package com.fzn.springcloud.controller;

import com.fzn.springcloud.entities.CommonResult;
import com.fzn.springcloud.entities.Payment;
import com.fzn.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @program: springcloud
 * 描述：      消费者 客户端
 * @author: fzn
 * @create: 2022-03-11 17:10
 **/
@RestController
@Slf4j
public class OrderController {
    // public static final String PAYMENT_SRV = "http://localhost:8001"; 不能写死
    // 通过在eureka上注册过的微服务名称调用
    public static final String PaymentSrv_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    @Resource
    private DiscoveryClient discoveryClient;
    @Resource
    private LoadBalancer loadBalancer;

    @GetMapping("/consumer/payment/create") //客户端用浏览器是get请求，但是底层实质发送post调用服务端8001
    public CommonResult<Payment> create(Payment payment) {
        // 请求地址 请求参数 响应对象
        return restTemplate.postForObject(PaymentSrv_URL + "/payment/create",payment,CommonResult.class);
    }


    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable Long id) {
        return restTemplate.getForObject(PaymentSrv_URL + "/payment/get/"+id, CommonResult.class, id);
    }

    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable Long id) {
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PaymentSrv_URL + "/payment/get/" + id, CommonResult.class);
        if (entity.getStatusCode().is2xxSuccessful()) {
            log.info(entity.getStatusCode()+"\t"+entity.getHeaders());
            return entity.getBody();
        }else {
            return new CommonResult<>(444,"操作失败");
        }
    }


    /**
     * 测试手写的负载均衡算法  轮询算法
     * @return
     */
    @GetMapping("/consumer/payment/lb")
    public String getPaymentLB() {
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");

        if(instances == null || instances.size()<=0) {
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }
    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin() {
        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
        return result;
    }
}